3x+(100-x)=180

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Solution for 3x+(100-x)=180 equation:


Simplifying
3x + (100 + -1x) = 180

Remove parenthesis around (100 + -1x)
3x + 100 + -1x = 180

Reorder the terms:
100 + 3x + -1x = 180

Combine like terms: 3x + -1x = 2x
100 + 2x = 180

Solving
100 + 2x = 180

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-100' to each side of the equation.
100 + -100 + 2x = 180 + -100

Combine like terms: 100 + -100 = 0
0 + 2x = 180 + -100
2x = 180 + -100

Combine like terms: 180 + -100 = 80
2x = 80

Divide each side by '2'.
x = 40

Simplifying
x = 40

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